Coil decoupling for magnetic resonance imaging

Abstract

A coil decoupling method for a magnetic resonance imaging device, including: sending an instruction causing a transmitter to send a transmitted signal, acquiring a received signal received by a receiver, wherein the received signal is a signal arriving at the receiver after the transmitted signal passes through two coils to be adjusted of a plurality of coils, determining the coupling value between the two coils to be adjusted based on the transmitted signal and the received signal, and sending an instruction for adjusting a decoupling component based on the coupling value.

The invention claimed is: 
     
       1. A coil decoupling method for a magnetic resonance imaging device, the magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the method comprising:
 sending an instruction causing the transmitter to send a transmitted signal; 
 acquiring a received signal received by the receiver, wherein the received signal is the transmitted signal that arrives at the receiver after passing through two coils to be adjusted of the plurality of coils, wherein one of the two coils to be adjusted is a transmitting coil operable to receive the transmitted signal sent by the transmitter, and the other of the two coils to be adjusted is a receiving coil operable to receive the signal sent by the transmitting coil; 
 determining a coupling value between the two coils to be adjusted based on the transmitted signal and the received signal; and 
 in response to a determination that the coupling value is less than a coupling threshold, sending an instruction for adjusting the decoupling component based on the coupling value, updating the coupling threshold with the coupling value, and sending another instruction causing the transmitter to send another transmitted signal. 
 
     
     
       2. The method according to  claim 1 , wherein the determining the coupling value between the two coils to be adjusted based on the transmitted signal and the received signal comprises:
 determining the coupling value between the two coils to be adjusted based on the transmitted signal, the received signal and calibration data, wherein the calibration data is determined based on a signal from the transmitter to the receiver but not passing through the plurality of coils. 
 
     
     
       3. The method according to  claim 2 , wherein the calibration data is determined based on a calibration signal sent by the transmitter and a signal received by the receiver and corresponding to the calibration signal. 
     
     
       4. The method according to  claim 3 , wherein the determining the coupling value between the two coils to be adjusted based on the transmitted signal, the received signal and calibration data comprises:
 acquiring a power of the transmitted signal and a power of the received signal; 
 calculating a first difference between the power of the transmitted signal and the power of the received signal; and 
 determining the coupling value between the two coils to be adjusted based on the first difference and the calibration data. 
 
     
     
       5. The method according to  claim 4 , wherein the calibration data comprises a second difference between a power of the calibration signal sent by the transmitter and the power of the signal received by the receiver that corresponds to the calibration signal. 
     
     
       6. The method according to  claim 1 , wherein the sending an instruction for adjusting the decoupling component based on the coupling value comprises:
 determining whether the coupling value is greater than the coupling threshold; and 
 sending an instruction for adjusting the decoupling component in response to a determination that the coupling value is greater than the coupling threshold. 
 
     
     
       7. The method according to  claim 6 , further comprising:
 executing the sending the instruction causing the transmitter to send a transmitted signal in response to a determination that the coupling value is greater than the coupling threshold. 
 
     
     
       8. The method according to  claim 1 , wherein the sending an instruction for adjusting the decoupling component based on the coupling value comprises:
 determining an adjustment amount for the decoupling component based on the coupling value; and 
 sending the adjustment amount to the decoupling component. 
 
     
     
       9. The method according to  claim 1 , wherein the decoupling component is a decoupling component disposed between the two coils to be adjusted. 
     
     
       10. The method according to  claim 1 , wherein the sending an instruction causing the transmitter to send a transmitted signal comprises:
 determining whether an object under test exists in the magnetic resonance imaging device; and 
 sending an instruction causing the transmitter to send a transmitted signal in response to a determination that the object under test exists in the magnetic resonance imaging device. 
 
     
     
       11. The method according to  claim 1 , the method further comprising:
 selecting two coils from the plurality of coils as the two coils to be adjusted based on a degree of coupling between two adjacent coils of the plurality of coils; and 
 sending an instruction for connecting the transmitting coil to the transmitter and connecting the receiving coil to the receiver. 
 
     
     
       12. An electronic device, comprising:
 a processor; and 
 a memory storing a program comprising instructions, wherein the instructions cause the processor to execute the method according to  claim 1  when executed by the processor. 
 
     
     
       13. A non-transient computer-readable storage medium storing a program comprising instructions for executing the method according to  claim 1  when the instructions are executed by one or more processors. 
     
     
       14. A coil decoupling apparatus for a magnetic resonance imaging device, the magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the coil decoupling apparatus comprising:
 a first sending module configured to send an instruction causing the transmitter to send a transmitted signal; 
 an acquisition module configured to acquire a received signal received by the receiver, wherein the received signal is the transmitted signal arriving at the receiver after passing through two coils to be adjusted of the plurality of coils, wherein one of the two coils to be adjusted is a transmitting coil operable to receive the transmitted signal sent by the transmitter, and the other of the two coils to be adjusted is a receiving coil operable to receive the signal sent by the transmitting coil; 
 a determination module configured to determine a coupling value between the two coils to be adjusted based on the transmitted signal and the received signal; and 
 a second sending module configured to, in response to a determination that the coupling value is less than a coupling threshold, send an instruction for adjusting the decoupling component based on the coupling value, update the coupling threshold with the coupling value, and send another instruction causing the transmitter to send another transmitted signal.